luebcke



P. E. LUEBCKE. INNER TUBE FOR VEHICLE TIRES.

APPLICATHON FILED MAY 21.19l7.

Patented Dec. 2, 19N).

Z pja' l inail-inn entres raient-fr ernten i PAULlE. LUEBCKE, OF CHICAGO, ILLINOIS, ASSIGNOR F ONE-HALF TO HORACE K.

, RYAN, 0F CHICAGO, ILLINOIS.

incarico.

' a citizen of the United States, residing at Chicago, in the county of Cook Vand State of Illinois, have invented certain new and useful Improvements in Inner Tubesv `for Vehicle-Tires, of which the following is av description.

Myl invention relates to the resilient inner4 tube or air container 'for a pneumatic vehicle tire.

Ihe obgfect of my invention is to provide an inner-tube having a thickened wear resisting portion at. its periphery of sufficient strength to maintain a substantially smooth surface even where the interior of the casing is irregular or worn `through, thusY avoiding blow outs and reducing the disk of puncture to a minimum owing to the thickness and resisting nature of the periphery 'of the tube.

To this end my invention consists in the novel construction, arrangement and combination of parts herein shown and described,

.and more particularly 'pointed out in the claim. y

In the accompanying drawings wherein like or similar reference characters indicate like or corresponding parts,

Figure 1 is a 'side eleva-tion of a portion of my improved tube with parts removed and broken awayto more clearly show the construction. A

Fig-2 is a section taken substantially on line 21--2 of Fig. l.

3v and 4 are views similar to Figs. l and 2 respectively showing a slightlyv modiiied form of my improvement. 4

In the form slown in the drawings my improved inner-tube comprises a tubular ring l of substantially the usual forni' with the inner bearing portion 2 formed of rubber or other suitable elastic material impervious to air'in the usual manner and of substantially the usual form and construction. The outer or tread portion 3 is preferably formed of canvas or other non-elastic material treated with rubber or other suitable substance to render the same impervious to air also. rIhe inner and outer portions are preferably connected along theinmargins as at 4 and by cement or vulcanizing to form a f permanent connection capable of withstandingl the various strains and 4deeions Specification of Letters Patent.

Application filed May 21, 1917.

INNER TUBE FOR VEHICLE-TIRES.

' Patenten ieee. e, isis.

Serial No. 169,822.

incident to the various changes in shape ot' the tube when in service.

In the form shown the non-elastic.portion `3 of the tube is provided with an elastic covvtube together as well as providing a more reliable connection between them and also providing for making repairs in substantially the usual manner in case the tread of my improved tube. should become punctured. In the preferred form shown the non-olas tic part 3 is comparatively thin at its margins and gradually increases in thickness toward its central portion, thus providing awear resisting tread of suiiicient strength and rigidity to resist any inequality or weakness in the tread of the outer casing which ordinarily would result in a rupture or blow out of both the tube and casing.

In the form shown in Figs. Sand 4 the several parts are constructed substantially as shown in Figs. l and 2 except that the non-elastic portion 3 is provided with an inner lining 7 formed of elastic impervious material as well as the outer coverin g 6 thus completely inclosing the non-elastic portion 3 in an impervious substance preferably of the same-general character as the elastic inner portion 2 of the tube, the invention being to provide a tread which is secure against the weakness usually resulting in ruptures or blow outs as well as providing against ordinary punctures and while the kcoverings 6 and 7 are described as beingV formed of material similar to that forming the part 2 elasticity is not essential so long as it is impervious to air or gas and can be securely attached at its margins to the part 2 to assist in forming a permanent connec tion between the parts 2 and 3.

Also while in the foregoing I have described my improved tube as formed of two secure a non-elastic periphery for the tube by securing a non-elastic reinforcement or lining Within the tube.

Having thus described my improvement it is obvious that various immaterial modifications may be made in my device Without departing from the spirit of my invention, hence I d0 not wish to be understood as limiting myself to the exact form or construction shown.

What I claim as new and desire to secure by Letters Patent is:

A device of the class described comprising a tubular ring composed of tivo partly tubular parts constituting respectively inner and outer Walls thereof, the part forming the inner Wall of the tubular ring being conetructed of impervious elastic material of substantially uniform thickness throughout, and the part forming. the outer Wall of the tubular ring comprising a plurality oi' sheets of inelastic material and a layer of impervious elastic material permanently connected together, said sheets of inelastic material being;` of graduatedmidths and arrange-d to afford a reinforce increasing in thickness toward the central portion thereot'.`

In testimony whereof, I have hereunto y signed my name in the presence of tiro subscribing witnesses.

PAUL `E. LUEBGKE. Witnesses:

BLANCHE CHALMERS, BURTON U. HILLS. 

